diff --git a/calc_closing_tag_overhead.py b/calc_closing_tag_overhead.py
new file mode 100644
index 0000000..42c87a9
--- /dev/null
+++ b/calc_closing_tag_overhead.py
@@ -0,0 +1,16 @@
+f = open("xml-sample-file.xml", "r")
+s = f.read()
+
+l = 0
+idx = 0
+while True:
+    beg = s.find("</", idx)
+    if beg < 0:
+        break
+    end = s.find(">", beg)
+    l += end - beg + 1
+    idx = end + 1
+
+f.close()
+
+print(f"{l}/{len(s)} ~= {int(l/len(s) * 100)}%")
\ No newline at end of file